Compilare: main.cpp: In function 'int main()': main.cpp:90:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr != na + nb || rest.size() != n - na - nb){ ~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:15:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("locala.in", "r", stdin); ^ main.cpp:16:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("locala.out", "w" ,stdout); ^ main.cpp:18:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &na, &nb); ^ main.cpp:20:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &va[i]), pus[va[i]] = 1; ^ main.cpp:22:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &vb[i]), pus[vb[i]] = 1; ^