Compilare: main.cpp: In function 'int main()': main.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<g[i].size(); j++) ~^~~~~~~~~~~~ main.cpp:95:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<succ[u].size(); i++){ ~^~~~~~~~~~~~~~~ main.cpp:103:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<comp[i].size(); j++) ~^~~~~~~~~~~~~~~ main.cpp:36:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("2sat.in", "r", stdin); ^ main.cpp:37:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.out", "w", stdout); ^ main.cpp:40:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:42:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^