Compilare: main.cpp: In function 'int main()': main.cpp:48:6: warning: this 'for' clause does not guard... [-Wmisleading-indentation] {for(auto point : ctc[i]) ^~~ main.cpp:50:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' printf("\n"); ^~~~~~ main.cpp:29:21: warning: unused variable 'j' [-Wunused-variable] int n , m , i , j , a , b ; ^ main.cpp:27:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","r",stdin); ^ main.cpp:28:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out","w",stdout); ^ main.cpp:33:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^