Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(first.col==sol[first.lin].size()){ ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:72:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(second.col==sol[second.lin].size()){ ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:31:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("conexidad.in", "r",stdin); ^ main.cpp:32:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("conexidad.out", "w",stdout); ^ main.cpp:34:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:36:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^