Compilare: main.cpp: In function 'std::pair<int, int> cmp(std::pair<int, int>, std::pair<int, int>)': main.cpp:9:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(a.first==b.first) ^ main.cpp: In function 'int solve()': main.cpp:60:9: warning: unused variable 'sol' [-Wunused-variable] int sol=-1; ^~~ main.cpp: In function 'int main()': main.cpp:82:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("flooow.in","r",stdin); ^ main.cpp:83:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("flooow.out","w",stdout); ^ main.cpp:87:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ main.cpp: In function 'int solve()': main.cpp:48:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:51:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^