Compilare: main.cpp: In function 'void dothing(int)': main.cpp:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int f = 0; f < 3*group.size(); f++) ~~^~~~~~~~~~~~~~~~ main.cpp:77:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < group.size(); i++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:122:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("routere.in", "r", stdin); ^ main.cpp:123:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("routere.out", "w", stdout); ^ main.cpp:124:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:125:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (int i = 0; i < n; i++) scanf("%d", &inp[i]); ^