Submission #50253

#	Time	Username	Problem	Language	Result	Execution time	Memory
50253		gs13105	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	238 ms	167876 KiB

foehn_phenomena

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <iterator>

using namespace std;

const int MAXN = 200000;

long long arr[MAXN + 10];

int main()
{
    //freopen("in", "r", stdin);
    //freopen("out", "w", stdout);

    int n, q, s, t, i;
    scanf("%d%d%d%d", &n, &q, &s, &t);

    int a, p;
    for(i = 0; i < n + 1; i++)
    {
        scanf("%d", &a);
        if(i != 0)
            arr[i] = a - p;

        p = a;
    }

    long long c = 0;
    for(i = 1; i <= n; i++)
        c -= 1LL * (arr[i] > 0 ? s : t) * arr[i];

    for(i = 0; i < q; i++)
    {
        int l, r, x;
        scanf("%d%d%d", &l, &r, &x);

        c += 1LL * (arr[l] > 0 ? s : t) * arr[l];
        arr[l] += x;
        c -= 1LL * (arr[l] > 0 ? s : t) * arr[l];

        r++;
        if(r != n + 1)
        {
            c += 1LL * (arr[r] > 0 ? s : t) * arr[r];
            arr[r] -= x;
            c -= 1LL * (arr[r] > 0 ? s : t) * arr[r];
        }

        printf("%lld\n", c);
    }
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:30:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d%d", &n, &q, &s, &t);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a);
         ~~~~~^~~~~~~~~~
foehn_phenomena.cpp:49:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d", &l, &r, &x);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60