Submission #479861

#	Time	Username	Problem	Language	Result	Execution time	Memory
479861		aris12345678	Deda (COCI17_deda)	C++14	140 / 140	874 ms	4436 KiB

deda

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
#define X first
#define Y second

const int mxN = 200005;
const int inf = 1e9+5;
int st[4*mxN];

void update(int p, int l, int r, int i, int v) {
    if(l == r)
        st[p] = v;
    else {
        int md = (l+r)/2;
        if(i <= md)
            update(2*p, l, md, i, v);
        else
            update(2*p+1, md+1, r, i, v);
        st[p] = min(st[2*p], st[2*p+1]);
    }
}

int Min(int p, int l, int r, int i, int j) {
    // if(i > r || l > j)
    //     return inf;
    if(i <= l && r <= j)
        return st[p];
    int md = (l+r)/2;
    if(j <= md)
        return Min(2*p, l, md, i, j);
    if(i > md)
        return Min(2*p+1, md+1, r, i, j);
    return min(Min(2*p, l, md, i, j), Min(2*p+1, md+1, r, i, j));
}

int main() {
    int n, q;
    scanf("%d %d\n", &n, &q);
    fill(st, st+4*mxN, inf);
    while(q--) {
        char type;
        int l, r;
        scanf(" %c %d %d", &type, &l, &r);
        if(type == 'M')
            update(1, 1, n, r, l);
        else {
            int st = r, en = n, md, ans = -1;
            while(st <= en) {
                md = (st+en)/2;
                if(Min(1, 1, n, r, md) <= l)
                    ans = md, en = md-1;
                else
                    st = md+1;
            }
            printf("%d\n", ans);
        }
    }
    return 0;
}

Compilation message (stderr)

deda.cpp: In function 'int main()':
deda.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |     scanf("%d %d\n", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
deda.cpp:46:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         scanf(" %c %d %d", &type, &l, &r);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 140 / 140