Eroare de compilare: main.cpp: In function 'void solve()': main.cpp:26:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (first > v.size()) ~~~~~~^~~~~~~~~~ main.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < first; i++) ~~^~~~~~~ main.cpp:39:5: error: 'o' was not declared in this scope o << index << " " << v[i].second << "\n"; ^ main.cpp: In function 'int main()': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) ~~^~~~ main.cpp:53:8: warning: unused variable 'o' [-Wunused-variable] FILE* o = fopen("grade.out", "w"); ^ main.cpp:54:21: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ main.cpp:59:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &k); ^ Non zero exit status: 1