Compilare: user.cpp: In function ‘void solve(int, int, int, int)’: user.cpp:18:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[n1].size(); i++) ^ user.cpp:22:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[n2].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:44:19: warning: format ‘%c’ expects a matching ‘char*’ argument [-Wformat=] scanf("%c"); ^ user.cpp:50:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ^ user.cpp:51:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l = j+1; l < g[i].size(); l++) ^ user.cpp:53:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ^ user.cpp:58:23: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d\n", sol); ^ user.cpp:30:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.in", "r", stdin); ^ user.cpp:31:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.out", "w", stdout); ^ user.cpp:34:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:37:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:43:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &car[i]); ^ user.cpp:44:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c"); ^