Compilare: main.cpp: In function 'int main()': main.cpp:57:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ciclu.size() - 1; i++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:66:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ciclu.size() - 1; i++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:74:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((c1 != 0 && c2 != 0) && (c1 != ciclu.size() - 1 && c2 != ciclu.size() - 1)) { ~~~^~~~~~~~~~~~~~~~~~~ main.cpp:74:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((c1 != 0 && c2 != 0) && (c1 != ciclu.size() - 1 && c2 != ciclu.size() - 1)) { ~~~^~~~~~~~~~~~~~~~~~~ main.cpp:83:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ciclu.size() - 1; i++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:32:37: 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:33:39: 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:34:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:36:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &c[i].a); ^ main.cpp:39:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &c[i].b); ^