Compilare: user.cpp: In function ‘int main()’: user.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[analyze].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~ user.cpp:39:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("djikstra.in", "r", stdin); ^ user.cpp:40:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("djikstra.out", "w", stdout); ^