integer-overflow

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 This is the Triangle problem from Codility: A zero-indexed array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and: A[P] + A[Q] > A[R], A[Q] + A[R] > A[P], A[R] + A[P] > A[Q]. Write a function: int solution(vector<int> &A); that, given a zero-indexed array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise. For example, given array A such that: A[0] = 10, A[1] = 2, A[2] = 5, A[3] = 1,

问题 If I have 2 int or long long variables, call them a and b , and I want to compute the sum (a + b) mod p , where p is a large prime integer, how can I utilize the modulo operator in C++ to achieve the desired result? I have tried (a + b) % p , but this gives overflow sometimes, since a + b will overflow before the mod is applied. Other similar approaches I have tried seem to avoid overflow, but give an incorrect result. How can I use the modulo operator in this case to correctly compute the

问题 If I have 2 int or long long variables, call them a and b , and I want to compute the sum (a + b) mod p , where p is a large prime integer, how can I utilize the modulo operator in C++ to achieve the desired result? I have tried (a + b) % p , but this gives overflow sometimes, since a + b will overflow before the mod is applied. Other similar approaches I have tried seem to avoid overflow, but give an incorrect result. How can I use the modulo operator in this case to correctly compute the

问题 My program frequently requires the following calculation to be performed: Given: N is a 32-bit integer D is a 32-bit integer abs(N) <= abs(D) D != 0 X is a 32-bit integer of any value Find: X * N / D as a rounded integer that is X scaled to N/D (i.e. 10 * 2 / 3 = 7) Obviously I could just use r=x*n/d directly but I will often get overflow from the x*n . If I instead do r=x*(n/d) then I only get 0 or x due to integer division dropping the fractional component. And then there's r=x*(float(n)/d)