Submission #1180105

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Source Code Expand

//in the name of allah
#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
bool ans[N];
bool ask(int v , int u){
        printf("? %d %d\n" , v , u);
        fflush(stdout);
        char ans;
        scanf(" %c" , &ans);
        return (ans == 'Y');
}

int main(){
        int n , m;
        scanf("%d %d" , &n , &m);
        if(n<=m){
                cout << "Impossible\n";
                return 0;
        }
        stack<int> st;
        st.push(0);
        for(int i=1 ; i<n+m ; i++){                
                if(!st.size()){
                        st.push(i);
                        continue;
                }              
                if(ask(i , st.top())){
                        if(ask(st.top() , i))
                                st.push(i);                      
                }else
                        st.pop();
        }
        int v = st.top();
        for(int i=0 ; i<n+m ; i++)
                ans[i] = ask(v , i);
        printf("! ");
        for(int i=0 ; i<n+m ; i++)
                printf("%d" , ans[i]);
        printf("\n");                       
        fflush(stdout);
}

Submission Info

Compile Error

./Main.cpp: In function ‘bool ask(int, int)’:
./Main.cpp:10:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf(" %c" , &ans);
                            ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:16:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d" , &n , &m);
                                 ^

Judge Result