Compilare: main.cpp: In function 'int main()': main.cpp:26:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n - x == m[x].size()) { ~~~~~~^~~~~~~~~~~~~~ main.cpp:27:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(m[x].size() > mx) { ~~~~~~~~~~~~^~~~ main.cpp:10:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.in", "r", stdin); ^ main.cpp:11:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.out", "w", stdout); ^