Submission #242621

#	Time	Username	Problem	Language	Result	Execution time	Memory
242621		SamAnd	Modsum (NOI12_modsum)	C++17	25 / 25	394 ms	1272 KiB

modsum

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 1003, M = 102;

int n;
int l[N], r[N];

int dp[N * M];
int ndp[N * M];

void solv()
{
    scanf("%d", &n);
    for (int i = 1; i <= n; ++i)
        scanf("%d%d", &l[i], &r[i]);
    dp[0] = 1;
    for (int i = 1; i <= n; ++i)
    {
        memset(ndp, 0, sizeof ndp);
        for (int j = 0; j < N * M; ++j)
        {
            if (!dp[j])
                continue;
            ndp[j + l[i]] += dp[j];
            ndp[j + r[i] + 1] -= dp[j];
        }
        memcpy(dp, ndp, sizeof ndp);
        for (int j = 1; j < N * M; ++j)
            dp[j] += dp[j - 1];
    }
    int ans = 0;
    for (int j = 0; j < N * M; ++j)
    {
        int u = (j * 1LL * j) % 5;
        u = (u * (u + 2)) % 5;
        ++u;
        ans += dp[j] * u;
    }
    printf("%d\n", ans);
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    //ios_base::sync_with_stdio(false), cin.tie(0);
    solv();
    return 0;
}

//while ((double)clock() / CLOCKS_PER_SEC <= 0.9){}

Compilation message (stderr)

modsum.cpp: In function 'void solv()':
modsum.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
modsum.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &l[i], &r[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5