Submission #1084671

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084671		KasymK	Bridges (APIO19_bridges)	C++17	0 / 100	248 ms	6224 KiB

bridges

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#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 = 5e4+5;

struct node{
    int val, l, r;
} seg[N<<2];

int v[N];

void build(int x, int l, int r){
    seg[x].l = l, seg[x].r = r;
    if(l == r){
        seg[x].val = v[l];
        return;
    }
    int mid = (l+r)>>1;
    build(x<<1, l, mid);
    build(x<<1|1, mid+1, r);
    seg[x].val = min(seg[x<<1].val, seg[x<<1|1].val);
}

void update(int x, int k, int u){
    if(seg[x].l == seg[x].r){
        seg[x].val = u;
        return;
    }
    int mid = (seg[x].l+seg[x].r)>>1;
    if(k <= mid)
        update(x<<1, k, u);
    else
        update(x<<1|1, k, u);
    seg[x].val = min(seg[x<<1].val, seg[x<<1|1].val);
}

int query(int x, int l, int r){
    if(l > r)
        return 0;
    if(seg[x].l == l and seg[x].r == r)
        return seg[x].val;
    int mid = (seg[x].l+seg[x].r)>>1;
    if(r <= mid)
        return query(x<<1, l, r);
    else if(l > mid)
        return query(x<<1|1, l, r);
    else
        return min(query(x<<1, l, mid), query(x<<1|1, mid+1, r));
}

int main(){
    // freopen("file.txt", "r", stdin);
    int n, m;
    scanf("%d%d", &n, &m);
    for(int i = 1; i <= m; ++i){
        int a, b, x;
        scanf("%d%d%d", &a, &b, &x);
        v[i] = x;
    }
    build(1, 1, n);
    int q;
    scanf("%d", &q);
    while(q--){
        int op;
        scanf("%d", &op);
        if(op == 1){
            int b, r;
            scanf("%d%d", &b, &r);
            update(1, b, r);
            continue;
        }
        // op = 2
        int s, w;
        scanf("%d%d", &s, &w);
        int l = 1, r = s, ans = 1e9;
        while(l <= r){
            int mid = (l+r)>>1;
            int mn = query(1, mid, s-1);
            if(mn < w)
                l = mid+1;
            else
                r = mid-1, ans = mid;
        }
        int ans1 = 0;
        l = s, r = m;
        while(l <= r){
            int mid = (l+r)>>1;
            int mn = query(1, s, mid);
            if(mn < w)
                r = mid-1;
            else
                l = mid+1, ans1 = mid;
        }
        int answer = 0;
        if(ans1 > s)
            ans1++;
        if(ans1 > s)
            answer += ans1-s;
        if(ans < s)
            answer += s-ans;
        printf("%d\n", answer+1);
    }
    return 0;
}

Compilation message (stderr)

bridges.cpp: In function 'int main()':
bridges.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
bridges.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         scanf("%d%d%d", &a, &b, &x);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:73:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
bridges.cpp:76:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         scanf("%d", &op);
      |         ~~~~~^~~~~~~~~~~
bridges.cpp:79:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |             scanf("%d%d", &b, &r);
      |             ~~~~~^~~~~~~~~~~~~~~~
bridges.cpp:85:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |         scanf("%d%d", &s, &w);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27