Compilare: main.cpp: In function 'int main()': main.cpp:53:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ciclu.size() - 1; j++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:67:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ciclu.size() - 1; j++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:28:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.in", "r", stdin); ^ main.cpp:29:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.out", "w", stdout); ^ main.cpp:30:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:32:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[0][i]); ^ main.cpp:35:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[1][i]); ^