제출 #636124

#제출 시각아이디문제언어결과실행 시간메모리
636124aris12345678Baloni (COCI15_baloni)C++14
100 / 100
123 ms34396 KiB
#include <bits/stdc++.h>
using namespace std;

const int mxN = 1e6+5;
int par[mxN], sz[mxN];
vector<int> pos[mxN];

void make_set(int x) {
    par[x] = x, sz[x] = 1;
}

int find_set(int x) {
    return par[x] == x ? x : par[x] = find_set(par[x]);
}

bool union_sets(int x, int y) {
    x = find_set(x), y = find_set(y);
    if(x == y)
        return false;
    if(sz[x] < sz[y])
        swap(x, y);
    par[y] = x, sz[x] += sz[y];
    return true;
}

int main() {
    int n;
    scanf("%d", &n);
    for(int i = 0; i < n; i++)
        make_set(i);
    int ans = n;
    for(int i = 0; i < n; i++) {
        int x;
        scanf("%d", &x);
        pos[x].push_back(i);
        if(!pos[x+1].empty()) {
            if(union_sets(i, pos[x+1].back()))
                ans--;
            pos[x+1].pop_back();
        }
    }
    printf("%d\n", ans);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

baloni.cpp: In function 'int main()':
baloni.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
baloni.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~
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