Compilare: main.cpp: In function 'int main()': main.cpp:104:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < comp[i].size(); j++) { ~~^~~~~~~~~~~~~~~~ main.cpp:68:38: 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:69:40: 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); ^