Compilare: main.cpp: In function 'int main()': main.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<imp.size(); i+=2){ ~^~~~~~~~~~~ main.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<ciclu.size()-1; i++){ ~^~~~~~~~~~~~~~~ main.cpp:26:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("ratway.in", "r", stdin); ^ main.cpp:27:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ratway.out", "w", stdout); ^ main.cpp:29:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:31:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^