Compilare: user.cpp: In function ‘void s2()’: user.cpp:53:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < grupe[i].size(); j++) ^ user.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < grupe[i].size(); j++) ^ user.cpp:56:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = j+1; k < grupe[i].size(); k++) ^ user.cpp:67:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < grupe[i].size(); j++) ^ user.cpp:68:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cols[j].size() > maxi) ^ user.cpp:76:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < cols[ind].size(); j++) ^ user.cpp:80:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < cols[x].size(); k++) ^ user.cpp:79:21: warning: unused variable ‘indi’ [-Wunused-variable] int indi; ^ user.cpp: In function ‘void citire()’: user.cpp:35:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:39:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &r); ^ user.cpp: In function ‘int main()’: user.cpp:121:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.in", "r", stdin); ^ user.cpp:122:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.out", "w", stdout); ^