题目链接

#include <stdio.h>

long long max (long long a, long long int b) {
    return (a > b) ? a : b;
}

int main() {
    int t, m;
    scanf("%d%d", &t, &m);

    long long b [101][1001] = {0};

    int time[1001], value[101];
	
    //注意这里从1开始
    for(int i = 1; i < m; i++) {
        int temp_time, val;

        scanf("%d%d", &temp_time, &val);

        time[i] = temp_time;
        value[i] = val;
    } 


    for(int i = 1; i <= m; i++) {
        for(int j = 1; j <= t; j++) {
            if(j < time[i]) {
                b[i][j] = b [i - 1][j];
            } else {
                b[i][j] = max((b[i - 1][j - time[i]] + value[i]), b[i - 1][j]); 
            }
        }
    }

    printf("%lld\n", b[m][t]);

    return 0;
}