洛谷p3353在你窗外闪耀的星星题解

//前缀和
//注意坑点
//窗户的边缘可以看到 
#include <cstdio>
#include <iostream>
using namespace std;
const int N = 100010;
int n, m, a[N], you = 1, ans = -0x3f3f3f3f, qzh[N];
int read() {
    int s = 0, w = 1;
    char ch = getchar();
    while(!isdigit(ch)) {if(ch == ‘-‘) w = -1;ch = getchar();}
    while(isdigit(ch)) {s = s * 10 + ch - ‘0‘;ch = getchar();}
    return s * w;
}
int main() {
    n = read(), m = read();
    for(int i = 1; i <= n; i++) {
        int x, y;
        x = read(), y = read();
        a[x] += y;
        you = max(you, x);
    }
    for(int i = 1; i <= you; i++) 
        qzh[i] = qzh[i - 1] + a[i];
    for(int i = 1; i <= you; i++) 
        ans = max(ans, qzh[i] - qzh[i - m]);
    printf("%d\n", ans);
    return 0;
}