Compilare: main.cpp: In function 'void dfs(int)': main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < apm[node].size(); i++){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:66:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < apm[node].size(); i++){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:70:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < people[whBus[x]].size(); j++){ ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < edge[x].size(); j++){ ~~^~~~~~~~~~~~~~~~ main.cpp:83:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("autobuze3.out", "w", stdout); ^ main.cpp: In function 'void Read(int&)': main.cpp:37:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:42:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^