Submission #488020

#	Time	Username	Problem	Language	Result	Execution time	Memory
488020		egekabas	Horses (IOI15_horses)	C++14	17 / 100	72 ms	57088 KiB

horses

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
const ll mod = 1e9+7;
struct node{
    ll y, lef, rig, lefmod, rigmod;
};
node merge(node a, node b){
    node ret;
    if(a.y > min(mod, a.rig*b.lef)*b.y){
        ret.y = a.y;
        ret.lef = a.lef;
        ret.rig = min(mod, min(mod, a.rig*b.lef)*b.rig);
        ret.lefmod = a.lefmod;
        ret.rigmod = a.rig*b.lef%mod*b.rig%mod;
    }
    else{
        ret.y = b.y;
        ret.lef = min(mod, min(mod, a.lef*a.rig)*b.lef);
        ret.rig = b.rig;
        ret.lefmod = a.lef*a.rig%mod*b.lef%mod;
        ret.rigmod = b.rigmod;
    }
    return ret;
}
node seg[2000009];
ll x[500009];
ll y[500009];
void upd(ll v, ll tl, ll tr, ll idx, ll xval, ll yval){
    if(tl == idx && tr == idx){
        seg[v] = {yval, xval, 1, xval, 1};
        return;
    }
    if(idx <= (tl+tr)/2)
        upd(2*v, tl, (tl+tr)/2, idx, xval, yval);
    else
        upd(2*v+1, (tl+tr)/2+1, tr, idx, xval, yval);
    seg[v] = merge(seg[2*v], seg[2*v+1]);    
}
void build(ll v, ll tl, ll tr){
    if(tl == tr){
        seg[v] = {y[tl], x[tl], 1, x[tl], 1};
        return;
    }
    build(2*v, tl, (tl+tr)/2);
    build(2*v+1, (tl+tr)/2+1, tr);
    seg[v] = merge(seg[2*v], seg[2*v+1]);    
}
ll n;
int init(int N, int X[], int Y[]) {
	n = N;
    for(int i = 0; i < N; ++i){
        x[i] = X[i];
        y[i] = Y[i];
    }
    build(1, 0, n-1);
    return seg[1].lefmod*seg[1].y%mod;
}

int updateX(int pos, int val) {	
    x[pos] = val;
    upd(1, 0, n-1, pos, x[pos], y[pos]);
    return seg[1].lefmod*seg[1].y%mod;
}

int updateY(int pos, int val) {
	y[pos] = val;
    upd(1, 0, n-1, pos, x[pos], y[pos]);
    return seg[1].lefmod*seg[1].y%mod;
}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:68:34: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   68 |     return seg[1].lefmod*seg[1].y%mod;
      |            ~~~~~~~~~~~~~~~~~~~~~~^~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:74:34: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   74 |     return seg[1].lefmod*seg[1].y%mod;
      |            ~~~~~~~~~~~~~~~~~~~~~~^~~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:80:34: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   80 |     return seg[1].lefmod*seg[1].y%mod;
      |            ~~~~~~~~~~~~~~~~~~~~~~^~~~

• Subtask 1: 17 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23