Submission #466753

#	Time	Username	Problem	Language	Result	Execution time	Memory
466753		M4mou	Handcrafted Gift (IOI20_gift)	C++17	Compilation error	0 ms	0 KiB

gift

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

vector<int>parent;
void init(int n) { parent.resize(n); for(int l=0;l<n;l++) parent[l]=l; }
int findset(int n) { return (parent[n]==n)?n:(parent[n]=findset(parent[n])); }
bool sameSet(int a, int b) { return findset(a)==findset(b); }
void unionSet(int a, int b) {
    if(sameSet(a, b)) return;
    a=findset(a); b=findset(b);
    parent[a]=b;
}

int construct(int n, int r, std::vector<int> a, std::vector<int> b, std::vector<int> x) {
    init(n+1);
    for(int i = 0: i < r; i++){
        if(x[i] == 2) continue;
        int j = a[i];
        while(findset(j) != findset(b[i])){
            unionSet(j,b[i]);
            j++;
        }
    }


    
    
    
    
    for(int i=0;i<r;i++){
        if(x[i]==1){
            continue;
        }
        if(findset(a[i])==findset(b[i])){
            return 0;
        }
    }
    string s ="R";
    
    for(int i=1;i<n;i++)
    {
        if(findset(i) != findset(i-1))
        if(s.back() == "R")s += "B";
        else s+= "R";
        else s+= s.back();
    }
    craft(s);
    return 1;
}

Compilation message (stderr)

gift.cpp: In function 'int construct(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
gift.cpp:17:15: error: initializer in range-based 'for' loop
   17 |     for(int i = 0: i < r; i++){
      |               ^
gift.cpp:17:25: error: expected ')' before ';' token
   17 |     for(int i = 0: i < r; i++){
      |        ~                ^
      |                         )
gift.cpp:17:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   17 |     for(int i = 0: i < r; i++){
      |     ^~~
gift.cpp:17:27: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   17 |     for(int i = 0: i < r; i++){
      |                           ^
gift.cpp:17:27: error: 'i' was not declared in this scope
gift.cpp:44:21: warning: comparison with string literal results in unspecified behavior [-Waddress]
   44 |         if(s.back() == "R")s += "B";
      |            ~~~~~~~~~^~~~~~
gift.cpp:44:21: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]