Compilare: main.cpp: In function 'void dfs(int)': main.cpp:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[u].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void build(int, int)': main.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < c[cmp].size() ; i ++) ~~^~~~~~~~~~~~~~~ main.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < nc[v].size() ; j ++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void afisare()': main.cpp:78:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < T[i].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:104:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < c[i].size() && ok ; j ++) ~~^~~~~~~~~~~~~ main.cpp:105:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = j + 1 ; k < c[i].size() && ok ; k ++) ~~^~~~~~~~~~~~~ main.cpp:83:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linegraph.in", "r", stdin); ^ main.cpp:84:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linegraph.out", "w", stdout); ^ main.cpp:86:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:90:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:93:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^