求助读入TLE了，请问是什么原因,谢谢

#pragma warning(disable : 6031)
#include<bits/stdc++.h>
using namespace std;

struct student {
	char s[25];
	int nian, yue, ri, ord;
	int ls;
};

student w[110];
int lw;


bool cmp_student(const student& a, const student& b) {
	if (a.nian != b.nian) return a.nian < b.nian;
	if (a.yue != b.yue) return a.yue < b.yue;
	if (a.ri != b.ri) return a.ri < b.ri;
	return (a.ord > b.ord);
}

int n;
char c;

int readint() {
	int res = 0;
	c = getchar();
	while (c >= '0' && c <= '9') {
		res = res * 10 + (c - '0');
		c = getchar();
	}
	return res;
}

void read_n_student() {
	for (int i = 0; i < n; i++) {
		c = getchar();
		while (c == '\r' || c == '\n') c = getchar();
		while (c!=' ') {
			w[lw].s[w[lw].ls++] = c;
			c = getchar();
		}

		int nian = 0;
		c = getchar();
		while (c != ' ') {
			nian = nian * 10 + (c - '0');
			c = getchar();
		}
		w[lw].nian = nian;

		int yue = 0;
		c = getchar();
		while (c != ' ') {
			yue = yue * 10 + (c - '0');
			c = getchar();
		}
		w[lw].yue = yue;

		int ri = 0;
		c = getchar();
		while (c != '\n' && c != '\r') {
			ri = ri * 10 + (c - '0');
			c = getchar();
		}
		w[lw].ri = ri;
		w[lw++].ord = i;
	}
}

int main() {

	n = readint();
	read_n_student();

	//sort(w, w + n, cmp_student);
	/*for (int i = 0; i < n; i++) {
		for (int j = 0; j < w[i].ls; j++) {
			putchar(w[i].s[j]);
		}
		putchar('\n');
	}*/

	return 0;
}