Compilare: main.cpp: In function 'void euler(int)': main.cpp:67:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(!cnt) return; ++all; ^~ main.cpp:67:22: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if(!cnt) return; ++all; ^~ main.cpp: In function 'void read()': main.cpp:24:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tester.in", "r", stdin); ^ main.cpp:25:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:28:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp: In function 'void solve()': main.cpp:55:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tester.out", "w", stdout); ^