Compilare: user.cpp: In function ‘int main()’: user.cpp:104:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < linie[i].size() - 1; j++) urm_linie[linie[i][j].first] = linie[i][j + 1].second; ^ user.cpp:109:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < coloana[i].size() - 1; j++) urm_coloana[coloana[i][j].first] = coloana[i][j + 1].second; ^ user.cpp:85:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoro.in", "r", stdin); ^ user.cpp:86:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoro.out", "w", stdout); ^