Zbrka

input/code.cpp: In function 'int main()':
input/code.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &c);
     ~~~~~^~~~~~~~~~~~~~~~

#include<stdio.h>
using ii=long;
const ii mod=1e9+7;
ii dp[2][10001];
int n,c,z;
int main()
{
    scanf("%d%d", &n, &c);
    dp[z][0] = 1;
    for (int i = 2; i <= n; ++i) {
        z=!z;
        ii s = 0;
        for (int y = 0; y <= c; ++y) {
            (s += dp[!z][y]) %= mod;
            if (y - i >= 0) s -= dp[!z][y - i];
            dp[z][y] = ((s += mod) %= mod);
        }
    }
    printf("%ld\n", dp[z][c]);
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED