Compilare: main.cpp: In function 'int calc_min_diff(int&, int&)': main.cpp:188:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int mlc = 0; mlc < v[l].size(); mlc++) ~~~~^~~~~~~~~~~~~ main.cpp:191:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = pos; j < v[r].size(); ++j) ~~^~~~~~~~~~~~~ main.cpp:196:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(mlc < v[l].size() && v[l][mlc] < v[r][j]) mlc++; ~~~~^~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:223:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".in", "r", stdin); ^ main.cpp:224:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".out", "w", stdout); ^