题目传送门

用线段树写的

#include <bits/stdc++.h>
using namespace std;
const int N = 1000010;
int k, n, c, ans;

struct link {
	int l, r, num;
} a[N];

bool cmp(link a, link b) {
	if (a.r != b.r) return a.r < b.r;
	return a.l < b.l;
}

struct Treenode {
	int l, r, maxn, tag;
} t[N << 2];

void build(int p, int l, int r) {
	t[p].l = l;
	t[p].r = r;
	t[p].maxn = 0;
	if (l == r) return;
	int mid = (l + r) >> 1;
	build(p << 1, l, mid);
	build((p << 1) + 1, mid + 1, r);
}

void spread(int p) {
	if(t[p].tag != 0) {
		t[p << 1].maxn += t[p].tag;
		t[(p << 1) + 1].maxn += t[p].tag;
		t[p << 1].tag += t[p].tag;
		t[(p << 1) + 1].tag += t[p].tag;
		t[p].tag = 0;
	}
}

void update(int p, int l, int r, int k) {
	if(l <= t[p].l and t[p].r <= r) {
		t[p].maxn += k;
		t[p].tag += k;
		return;
	}
	spread(p);
	int mid = (t[p].l + t[p].r) >> 1;
	if (l <= mid) update(p << 1, l, r, k);
	if (r > mid) update((p << 1) + 1, l, r, k); 
	t[p].maxn = max (t[p << 1].maxn, t[(p << 1) + 1].maxn);
}

int query(int p, int l, int r) {
	if(l <= t[p].l and t[p].r <= r) return t[p].maxn;
	spread(p);
	int mid = (t[p].l + t[p].r) >> 1, res = 0;
	if (l <= mid) res = max (res, query(p << 1, l, r));
	if (r > mid) res = max (res, query((p << 1) + 1, l, r));
	t[p].maxn = max (t[p << 1].maxn, t[(p << 1) + 1].maxn);
	return res; 
}

int main() {
	cin >> k >> n >> c;
	for (int i = 1; i <= k; i++) cin >> a[i].l >> a[i].r >> a[i].num;
	sort(a + 1,a + 1 + k,cmp);
	build(1, 1, n);
	for (int i = 1; i <= k; i++) {
		int res = min (a[i].num, c - query(1, a[i].l, a[i].r - 1));
//		cout << t[1].maxn << endl;
//		cout << res << " " << query(1, a[i].l, a[i].r - 1) << endl;
		update(1, a[i].l, a[i].r - 1, res);
		ans += res;
	}
	cout << ans << endl;
	return 0;
}

编译显示 Compile Error

具体内容：

/tmp/compiler_kt94ss0n/src:10:14: 错误：expected ‘)’ before ‘a’
   10 | bool cmp(link a, link b) {
      |         ~    ^~
      |              )
/tmp/compiler_kt94ss0n/src:10:22: 错误：expected ‘)’ before ‘b’
   10 | bool cmp(link a, link b) {
      |         ~            ^~
      |                      )
/tmp/compiler_kt94ss0n/src:10:24: 错误：expression list treated as compound expression in initializer [-fpermissive]
   10 | bool cmp(link a, link b) {
      |                        ^
/tmp/compiler_kt94ss0n/src:10:10: 警告：left operand of comma operator is a reference, not call, to function ‘link’ [-Waddress]
   10 | bool cmp(link a, link b) {
      |          ^~~~
/tmp/compiler_kt94ss0n/src:10:10: 警告：left operand of comma operator has no effect [-Wunused-value]
/tmp/compiler_kt94ss0n/src:10:24: 警告：‘int link(const char*, const char*)’的地址永远不会为 NULL [-Waddress]
   10 | bool cmp(link a, link b) {
      |                        ^
/tmp/compiler_kt94ss0n/src:10:26: 错误：expected ‘,’ or ‘;’ before ‘{’ token
   10 | bool cmp(link a, link b) {
      |                          ^
In file included from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algobase.h:71,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/char_traits.h:39,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/ios:40,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/istream:38,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/sstream:38,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/complex:45,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/ccomplex:39,
                 from /nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/x86_64-unknown-linux-gnu/bits/stdc++.h:54,
                 from /tmp/compiler_kt94ss0n/src:1:
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/predefined_ops.h: In instantiation of ‘constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = link*; _Iterator2 = link*; _Compare = bool]’:
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:81:17:   required from ‘void std::__move_median_to_first(_Iterator, _Iterator, _Iterator, _Iterator, _Compare) [with _Iterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1920:34:   required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1952:38:   required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = link*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1967:25:   required from ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:4899:18:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = link*; _Compare = bool]’
/tmp/compiler_kt94ss0n/src:65:26:   required from here
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/predefined_ops.h:143:18: 错误：expression cannot be used as a function
  143 |         { return bool(_M_comp(*__it1, *__it2)); }
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/predefined_ops.h: In instantiation of ‘bool __gnu_cxx::__ops::_Val_comp_iter<_Compare>::operator()(_Value&, _Iterator) [with _Value = link; _Iterator = link*; _Compare = bool]’:
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1827:20:   required from ‘void std::__unguarded_linear_insert(_RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Val_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1854:36:   required from ‘void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1884:25:   required from ‘void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1970:31:   required from ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:4899:18:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = link*; _Compare = bool]’
/tmp/compiler_kt94ss0n/src:65:26:   required from here
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/predefined_ops.h:215:11: 错误：expression cannot be used as a function
  215 |  { return bool(_M_comp(__val, *__it)); }
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/predefined_ops.h: In instantiation of ‘bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = link*; _Value = link; _Compare = bool]’:
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_heap.h:133:48:   required from ‘void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = link*; _Distance = long int; _Tp = link; _Compare = __gnu_cxx::__ops::_Iter_comp_val<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_heap.h:237:23:   required from ‘void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = link*; _Distance = long int; _Tp = link; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_heap.h:342:22:   required from ‘void std::__make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare&) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1671:23:   required from ‘void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1932:25:   required from ‘void std::__partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1947:27:   required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = link*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:1967:25:   required from ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = link*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool>]’
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/stl_algo.h:4899:18:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = link*; _Compare = bool]’
/tmp/compiler_kt94ss0n/src:65:26:   required from here
/nix/store/bbmwawbq7wjb54fa35wr72alcm083d1f-luogu-gcc-9.3.0/include/c++/9.3.0/bits/predefined_ops.h:177:11: 错误：expression cannot be used as a function
  177 |  { return bool(_M_comp(*__it, __val)); }
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~