Compilare: main.cpp: In function 'int main()': main.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[x].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:17:41: warning: unused variable 'smin' [-Wunused-variable] int n , i , j , lvl , x , y , sum , smin; ^~~~ main.cpp:15:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.in" , "r" , stdin); ^ main.cpp:16:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.out" , "w" , stdout); ^ main.cpp:18:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ main.cpp:23:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%hd" , &v[i]); ^