Submission #1102978

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102978		KasymK	Simple game (IZhO17_game)	C++17	100 / 100	52 ms	5200 KiB

game

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss secox
#define all(v) v.begin(), v.ex()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 1e5+5;
const int MAX = 1e6;
int v[N], F[MAX+7];

int main(){
    // freopen("file.txt", "r", stdin);
    int n, q;
    scanf("%d%d", &n, &q);
    for(int i = 1; i <= n; ++i){
        int x;
        scanf("%d", &x);
        v[i] = x;
    }
    auto wow = [&](int k, int u) {
        for(; k <= MAX; k += k&-k)
            F[k] += u;
    };
    auto how = [&](int a, int b, int val) {
        if(a>b)
            swap(a, b);
        wow(a, val);
        wow(b+1, -val);
    };
    for(int i = 1; i < n; ++i)
        how(v[i], v[i+1], 1);
    while(q--){
        int op;
        scanf("%d", &op);
        if(op==1){
            int k, u;
            scanf("%d%d", &k, &u);
            if(k>1)
                how(v[k], v[k-1], -1);
            if(k<n)
                how(v[k], v[k+1], -1);
            v[k] = u;
            if(k>1)
                how(v[k], v[k-1], 1);
            if(k<n)
                how(v[k], v[k+1], 1);
            continue;
        }
        int k;
        scanf("%d", &k);
        int answer = 0;
        for(; k >= 1; k -= k&-k)
            answer += F[k];
        printf("%d\n", answer);
    }
    return 0;
}

Compilation message (stderr)

game.cpp: In function 'int main()':
game.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
game.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~
game.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         scanf("%d", &op);
      |         ~~~~~^~~~~~~~~~~
game.cpp:45:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |             scanf("%d%d", &k, &u);
      |             ~~~~~^~~~~~~~~~~~~~~~
game.cpp:58:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         scanf("%d", &k);
      |         ~~~~~^~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 27 / 27
• Subtask 3: 51 / 51