Compilare: main.cpp: In function 'int path(int)': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < s.length() ; j ++) ~~^~~~~~~~~~~~ main.cpp:53:69: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((j > 0 && isdigit(s[j - 1]) && !isdigit(s[j])) || (j == s.length() - 1 && isdigit(s[j]))) ~~^~~~~~~~~~~~~~~~~ main.cpp:40:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("senat.in" , "r" , stdin); ^ main.cpp:41:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("senat.out" , "w" , stdout); ^ main.cpp:43:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n" , &n , &m); ^