Compilare: main.cpp: In function 'int main()': main.cpp:45:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[u].size(); i++) ~^~~~~~~~~~~~ main.cpp:46:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<g[u].size(); j++) ~^~~~~~~~~~~~ main.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=j+1; l<g[u].size(); l++) ~^~~~~~~~~~~~ main.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[u].size(); i++) ~^~~~~~~~~~~~ main.cpp:51:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<g[u].size(); j++) ~^~~~~~~~~~~~ main.cpp:54:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[u].size(); i++){ ~^~~~~~~~~~~~ main.cpp:27:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("count.in", "r", stdin); ^ main.cpp:28:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("count.out", "w", stdout); ^ main.cpp:30:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:32:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^