Submission #1084711

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084711		Kerim	Bridges (APIO19_bridges)	C++17	0 / 100	45 ms	4692 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);
          	v[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;
        // }
        // printf("%d\n", answer+1);
        int ans = 1e9, ans1 = 0;
        for(int i = s-1; i >= 1; --i){
            if(v[i] < w){
                ans = i+1;
                break;
            }
            if(i == 1)
                ans = i;
        }
        for(int i = s; i <= m; ++i){
            if(v[i] < w){
                ans1 = i;
                break;
            }
            if(i == m)
                ans1 = i+1;
        }
        // printf("ans| %d   ans1| %d\n", ans, ans1);
        int answer = max(0, ans1-ans+1);
        printf("%d\n", answer);
    }
    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:86:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |         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