Submission #988992

#	Time	Username	Problem	Language	Result	Execution time	Memory
988992		tosivanmak	Horses (IOI15_horses)	C++17	Compilation error	0 ms	0 KiB

horses

#include <bits/stdc++.h>
using namespace std;
#define lol long long
const lol maxn = 5e5 + 5, maxN = 2e6 + 5, M = 1e9 + 7, MX = INT_MAX;

lol pwr(lol val, lol p) {
    if (p==0) return 1;
    lol cur = pwr(val, p/2);
    cur = cur * cur % M;
    if (p%2==1) cur = cur * val % M;
    return cur;
}

lol n, x[maxn], y[maxn], all;
lol seg[maxN];
void build(int id, int l, int r) {
    if (l==r) {
        seg[id] = y[l];
        return;
    }
    int mid = (l+r)/2;
    build(id*2, l, mid);
    build(id*2+1, mid+1, r);
    seg[id] = max(seg[id*2], seg[id*2+1]);
}
void update(int id, int l, int r, int target, int val) {
    if (r<target || target<l) return;
    if (l==r) {
        seg[id] = val;
        return;
    }
    int mid = (l+r)/2;
    update(id*2, l, mid, target, val);
    update(id*2+1, mid+1, r, target, val);
    seg[id] = max(seg[id*2], seg[id*2+1]);
}
lol mx(int id, int l, int r, int findl, int findr) {
    if (r<findl || findr<l) return 0;
    if (findl<=l && r<=findr) return seg[id];
    int mid = (l+r)/2;
    return max(mx(id*2, l, mid, findl, findr), mx(id*2+1, mid+1, r, findl, findr));
}

set<int> s;

int32_t solve() {
    auto it = next(s.rbegin());
    lol cnt1 = 1;
    if (*it==-1) return mx(1, 0, n-1, 0, n-1);
    while (cnt1 <= MX) {
        cnt1 *= x[*it];
        it = next(it);
        if (*it==-1) break;
    }
    lol ans = 1;
    if (*it == -1) {
        it = prev(it);
        ans = max(mx(1, 0, n-1, 0, *it-1), ans);
        // cout << ans << endl;
    }
    lol cnt2 = 1;
    while (it != s.rbegin()) {
        cnt2 *= x[*it];
        ans = max(mx(1, 0, n-1, *it, *prev(it) - 1) * cnt2, ans);
        // cout << *it << " " << *prev(it)-1 << " " << mx(1, 0, n-1, *it, *prev(it) - 1) << " " << cnt2 << endl;
        it = prev(it);
    }
    ans %= M;
    ans = ans * (all * pwr(cnt1, M-2) % M) % M;
    return ans;
}

lol init(int N, lol X[], lol Y[]) {
	n = N;
    all = 1;
    s.insert(-1);
    s.insert(n);
    for (int i=0;i<n;i++) {
        x[i] = X[i], y[i] = Y[i];
        all = all * x[i] % M;
        if (x[i]!=1) s.insert(i);
    }
    build(1, 0, n-1);
    return solve();
}

lol updateX(int pos, lol val) {	
	if (val==1) s.erase(pos);
    // cout << x[pos] << " " << val << endl;
    if (x[pos]==1 && val!=1) {
        s.insert(pos);
        // cout << "test" << endl;
    }
    all = all * pwr(x[pos], M-2) % M;
    x[pos] = val;
    all = all * val % M;
    return solve();
}

lol updateY(int pos, lol val) {
	update(1, 0, n-1, pos, val);
    return solve();
}

Compilation message (stderr)

horses.cpp: In function 'int32_t solve()':
horses.cpp:49:35: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   49 |     if (*it==-1) return mx(1, 0, n-1, 0, n-1);
      |                                  ~^~
horses.cpp:49:43: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   49 |     if (*it==-1) return mx(1, 0, n-1, 0, n-1);
      |                                          ~^~
horses.cpp:49:27: warning: conversion from 'long long int' to 'int32_t' {aka 'int'} may change value [-Wconversion]
   49 |     if (*it==-1) return mx(1, 0, n-1, 0, n-1);
      |                         ~~^~~~~~~~~~~~~~~~~~~
horses.cpp:58:29: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   58 |         ans = max(mx(1, 0, n-1, 0, *it-1), ans);
      |                            ~^~
horses.cpp:64:29: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   64 |         ans = max(mx(1, 0, n-1, *it, *prev(it) - 1) * cnt2, ans);
      |                            ~^~
horses.cpp:70:12: warning: conversion from 'long long int' to 'int32_t' {aka 'int'} may change value [-Wconversion]
   70 |     return ans;
      |            ^~~
horses.cpp: In function 'long long int init(int, long long int*, long long int*)':
horses.cpp:77:14: warning: conversion from 'long long int' to 'std::set<int>::value_type' {aka 'int'} may change value [-Wconversion]
   77 |     s.insert(n);
      |              ^
horses.cpp:83:18: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   83 |     build(1, 0, n-1);
      |                 ~^~
horses.cpp: In function 'long long int updateY(int, long long int)':
horses.cpp:101:16: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  101 |  update(1, 0, n-1, pos, val);
      |               ~^~
horses.cpp:101:25: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  101 |  update(1, 0, n-1, pos, val);
      |                         ^~~
/usr/bin/ld: /tmp/ccx458UP.o: in function `main':
grader.c:(.text.startup+0xaa): undefined reference to `init(int, int*, int*)'
/usr/bin/ld: grader.c:(.text.startup+0x113): undefined reference to `updateX(int, int)'
/usr/bin/ld: grader.c:(.text.startup+0x16d): undefined reference to `updateY(int, int)'
collect2: error: ld returned 1 exit status